利用钛合金β稳定系数K_β设计制备了4种具有不同组元和成分的医用钛合金,4种钛合金的K_β值均在1.0～1.5之间,属于理论上的近β型钛合金.通过X射线衍射分析和背散射电子衍射分析,从4种合金中优化出均匀合金化的3元β型医用Ti-25.6Nb-19.4Ta(%,质量分数)合金.利用硬度测试、压缩实验与透射电子显微镜(TEM)等手段对Ti-25.6Nb-19.4Ta合金在铸态、固溶态和400℃不同时间时效处理后的性能和微观结构进行了测试与分析,结果显示:Ti-25.6Nb-19.4Ta合金经过400℃时效处理后,其硬度、强度、弹性模量等随α相、ω相的析出变化明显.对这些变化的分析,揭示了合金的性能与显微结构的密切关系.
With the aid of K_β calculation of β stability parameter for Ti-based alloys, four kinds of biomedical Ti-based alloys with different components and compositions were designed and prepared. All these Ti-based alloys had a K_β value of 1.0 ～ 1.5, and theoret-ically belonged to a near β-type. It was clearly revealed by means of X-ray diffraction and hack-scattered electron imaging that, of the four alloys prepared for biomedical application, ternary alloy Ti-25.6Nb-19.4Ta (%, mass fraction) was the most homogeneous β al-loy. For Ti-25.6Nb-19.4Ta alloy in states of as-cast, solid solution and aging treatment at 400 ℃ for different periods of time, hard-hess testing, compression deformation and transmission electron microscopy observations were carried out to reveal and analyze the cor-responding property and microstructure. The results showed that the precipitation of α- and ω-phases could lead to significant variations of hardness, strength, elastic modulus for the Ti-25.6Nb-19.4Ta alloy subjected to aging treatment at 400 ℃. The close relationship between the properties and microstructures could be revealed from these variations.
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